Permission denied due to missing filter for find_dfu_devices

[lancelot666de]

When having USB devices exposing a DFU interface, greatfet firmware fails with a permission denied.

The reason seems that the arguments filtering the device are not passed to the function _find_dfudevices. Changing the call from

list(self.find_dfu_devices())  

to

list(self.find_dfu_devices(*args, **kwargs))

seems to fix the problem. The diff between the working version and the version of the repo is given next:

140c140
<         devices = list(self.find_dfu_devices(*args, **kwargs))
---
>         devices = list(self.find_dfu_devices())

[antoinevg]

Fixed in #5